<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id: RobotCheckBehavior.class.php 2616 2012-01-16 08:36:46Z liu21st $


class RobotCheckBehavior extends Behavior {
	protected $options = array ('LIMIT_ROBOT_VISIT' => true );
	public function run(&$params) {
		// 机器人访问检测
		if (C ( 'LIMIT_ROBOT_VISIT' ) && self::isRobot ()) {
			// 禁止机器人访问
			exit ( 'Access Denied' );
		}
	}
	
	static private function isRobot() {
		static $_robot = null;
		if (is_null ( $_robot )) {
			$spiders = 'Bot|Crawl|Spider|slurp|sohu-search|lycos|robozilla';
			$browsers = 'MSIE|Netscape|Opera|Konqueror|Mozilla';
			if (preg_match ( "/($browsers)/", $_SERVER ['HTTP_USER_AGENT'] )) {
				$_robot = false;
			} elseif (preg_match ( "/($spiders)/", $_SERVER ['HTTP_USER_AGENT'] )) {
				$_robot = true;
			} else {
				$_robot = false;
			}
		}
		return $_robot;
	}
}